Self-locking door bolt



Feb. 16 1926. 1,573,653

J. H. STEWART SELF Locum noon BOLT Filed Feb. '11. 1925 2 Sheets-Sheet 1 I IIVVENTOR I QIEJHNHSIZ' HET Feb. 16,1926. 1,573,653

J. H. STEWART SELF LOCKING DOOR BOLT Filed Feb. 11, 1925 2 Sheets-Sheet 2 I I 7 KKi v I 8y m I I ATTORNEYS To all whom it may concern:

leased andmoved tothe locking Patented Feb. 16, 1926.

UNITED STATES PATENT OFFICE.

JOHN H. STEWART, 0F RUTHE FORD, NEwJERsEY.

Y Application filed February Be it known that I, JOHN H. STEWART, a citizen of the Dominion of 5 Canada, and a resident of Rutherford, in the county of Bergen and State ot'New ersey, have invented anew and Improved Self-Locking Door Bolt, of which the following is a description. I Q

My invention relates to a self-lockmg door-bolt and is more particularly intended for emplacement on a swing door.

v and other objects are attained will clearly appear as the description proceeds.

Reference 18 to be had to the accompanying drawings forming a partof this specification, it being understood that the drawings are merely illustrative of one example of the invention.

'Figure 1 is a pferspectiveview of a bolt assemblage embodying nyinvention showing the same emplaced on a swing door having a sliding door section; e V

- "Figure 2is 1a horizontalsection as indi- I cated by the line 2-2 of Figure 1;

Figure 3 is a front'elevation, part being broken away;

- Figure 4 is a side elevation of theupper part of the self-locking bolt-show-ing the same in the locking position, a portion of the door lintel being shown in-section;

'Figure 5 is a side elevation of the upper end of the door boltand guard therefor with the bolt' in thfe'unlocking position; Figures (Sand I 7 are horizontal sections respectively on the lines 6V6 and 7-7, 'Figure8. V' I F-igure 8 is ahorizontal section as in dicated by the line 8-8, Figure 3; a

Figure 9 is a' perspective view of the lower ends of the angle bars showing the overlapping members thereof-to'permit the bars to'be disposed one against the otherin the closed position of the bars.

'In. carrying out my invention in accordance with the illustrated example a'bolt is formed with an upper vertical section 10 formed with an oblique upper edge.

SELF-LOCKING noon BOLT.

11,1925. 'seiia No. 8,469.

and a lower vertical section 11. The adjacent ends of the sections 10, 11 overlap and are formed with racks 12 meshingwith which racks is an intermediate. pinion 18 mounted to turn on a pin 14 in a casing 15.

Thelowerbolt section 11 passes through a fixed guide keeper l6 and is adapted to enter a recess 17 in the 'door sill A. The upper end or the upper bolt section is adapted to pass through a strike, plate or escutcheon '7 18 and lnto a recess 19 in the lintel B of the e g door.

The arrangement of the bolt sections 10, 11 with their racks 12engaging thepinion 18, such that the weight of the lower bolt section 11 tends to cause movementvof said bolt section downwardly to enter the recesss l7, and through the pinion 13 tends to raisethe upper bolt section 10 to cause it to enter the recess 19. a I I The upper bolt section has guided movement througha keeper 20 on a securing plate '21. Said securing plate 21, the keeper l6 and. the casing 15 may besuitably secured to the hinged door C. In the illustrated embodiment of my invention the bolt ass'embl age is employed in connection with a door comprising the hinge section C and a sliding section D thereon, said door sections being shown as suspended by a hanger bar assemblage, the main features'of which form the sub]ect of United States Letters Patent, granted to me May 27, 1919, Number 1,305,- 021. Said hanger means comprises a'pair of fiat bars 22, 23 which are movably connected at the center by a pivot 24 and so connected with the door sections C, D that when the door is closed, said bars will lie parallel with each other in side by side relation and when the sliding door section is in open position-the bars will cross each other in the form of the letter X. The hanger bars 22, 23, in the present instance have connection with vertical angle bar25 on the'hinged door. section to facilitate the emplacement ofthe-bolt assemblage and the hanger, and the casing 15, the keeper 16 and the securing plate 21 are suitably fastened to an angle-bar 26 on the hinged door section C, said angle bar 26 being appurtenant to the hanger assemblage. At the lower end of the bar 22 there is a member 122 offset to lie in a para'llel plane with the body of said bar and Similarly, a bar 23 has an oifset member 123 with an oblique upper edge. The lower end'of the bar 22 has an oblique terminal edge 222 to mate the oblique upper edge of the member 123 and the bar 23 has an oblique bottom edge 223 to mate the oblique upper edge of the member 122, whereby the members 122, 123 take the pivot 32 slidable in registering slots 83 in the angle bars 25, 26. The numeral 3% indicates reinforcing bearing plates applied to the angle bars 25, 26 along the slotted area thereof.

It will be observed particularly from Figures 6 to S that the bars 25, 26 applied to the respective door sections are spaced a distance to accommodate between them the hanger bars 22, 23 and also it will be clear from a comparison or" Figure 6 with Figure 7 that except at the upper ends of the bolt sections 10, 11, said bolt sections are flattened, the offset bolt-like terminals being respectively above and below the ends oi? the hanger bars 22, 23. lhus, said hanger bars 22, 23 have clearance to move in a plane at a side of the bolt sections 1O, 11 between the upper and lower offset bolt-like ends to and from a position between the bars 25, 26.

In order to hold the bolt sections in the unlocking or release position notwithstanding the tendency of the sections to assume the closed position under the weight of the lower section 11, I provide a guard 27 pivoted at its sides as at 28 to the securing plate 21. The guard 27 is of a shape to present a cross piece 29 at the top thereof extending between the sides of the guard which is adapted to assume a position above and in line with the upper bolt section 10 when the latter is in the release position as in Figure 5.

The weight of the lower portion of the guard 27 preponderates so as to tend to swing the said guard to the outer position whenever the bolt section 10 moves below the bar 29 of the guard. 'With the above described guard functioning as specified, it will be clear that when the guard is over the end of the upper bolt section, said upper bolt section cannot rise to assume the locking position and thus the lower section 11 cannot gravitate to a lowered position where it would engage the floor and mar the same or catch any objectat the floor level. The bolt sections 10, 11 are moved relatively to each other by lifting the lower section 11 through the medium of a lift lug 30 thereon, said lug extending outwardly through a slot 31 in the casing 15 to be conveniently grasped.

lVith the described construction it the lower bolt section be lifted through the medium of the lug 30, said lower section will be withdrawn from the recess 17 to the release position. At the same time the racks 12 and pinion 13 will cause the upper bolt section 10 to be pulled downwardly and withdraw said section from the recess 19 and bring the upper end of the bolt section 10 below the plane of the top bar 29 of guard 27, thereby permitting said guard to automatically assui 1e a position with the bar 29 above the bolt, thereby restraining the bolt against upward movement under the weight of the lower bolt section 11. When the. door G is closed the bar 19 on the guard 27 will contact with the strike plate or escutcheon 18 causing the guard 27 to be moved away from the path of the bolt section 10, thereby permitting said bolt section to move upwardly into the recess 19 under the weight or. the lower bolt section 11.

I would state in conclusion that while the illustrated example constitutes a practical embodiment of my invention, 1 do not limit myself strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departure from the s irit or the invention as lefined in the appended claims.

Having thus described my invention, I claim:

1. A self-locking door bolt including a sliding bolt section, gravity means tending to move said bolt section upwardly to looking position, and a movably mounted guard adapted to move over the upper end of said bolt section to hold said section restrained against movement to the locking position and prevent said gravity means from -i'unctioning, said guard having a member projecting, when the guard is over the bolt, beyond the vertical plane in which the bolt is disposed to position said member for contact with a door lintel for causing the guard to be moved to a position releasing said bolt and permitting said gravity means to function in moving the bolt section to looking position.

2. A self-locking door bolt including upper and lower vertically disposed sections overlapped at their adjacent ends and formed with racks, an intermediate pinion engaging said racks, the lower section having a preponderance of weight tending to move to the lowered locking position and adapted through said racks and pinion to move the upper section upwardly into looking position; together with a guard movable to a position in the path of the upper bolt section for restraining said upper bolt section against movement to the lo'cking position and preventing the lower bolt section from gravitating to the lower position, said guard when in the bolt restraining position projecting beyond the bolt sufficient to contact with the door lintel.

3. A self-locking door bolt including a slide bolt section, means tending to move said bolt section to locking position; and a guard pivotally mounted adjacent to said bolt section, and swingable to a position over said bolt section to restrain the same against movement to locking position, said guard pro ecting above-the posltion of the bolt section when in the bolt restraining position whereby the guard Will contact with the door lintel.

4; In a device of the class described, upper and lower bolt sections, means whereby the weight of the lower section tends to move the upper section to locking position, a bar, means mounting said bolt sections on said bar, said bar adapted to be secured to a door section to move therewith, a bar adapted to be secured to a second door section to move therewith, and door hanger bars each secured at one end to said first and second mentioned bars and adapted attheir other ends to be secured to a door section, said first-mentioned bar and said second-men tioned bar being spaced to accommodate said hanger bars therebetween, and said hanger bars being mounted to move in a plane at a side of said bolt sections to and from positions between said first and second mentioned bars.

'5. A self-locking door-bolt including a vertical bolt section, means tending to move said bolt section upwardly to locking position in engagement with a door lintel, and a guard pivotally mounted adjacent to said bolt section, said guard being vertically disposed and over-weighted at its lower end to tend to move to a position over said bolt section to restrain the same against upward movement to locking position.

6. In a device of the class described, upper and lower vertical bolt sections, means whereby the weight of the lower section tends to move the upper section upwardly to locking position, the upper locking terminal of the'upper section and the lower locking terminal of the lower bolt section being ofi'set laterally to lie in planes at the sides of the planes of the bodies of the sections, and a guard, and means to pivotally mount the guard at a side of the offset locking terminal of the said upper section, the lower end of said guard being over-weighted tending to cause the guard to. move into the path. of said locking terminal to hold thevsame from a movement to the locking position. 1

"7. 111a door locking means, upper and lower vertically disposed bolt sections,

means whereby the weight of the lower section tends to move the upper section upwardly to locki-ngposition, the upper section having'an ofisetlocking terminal at its upper end and the lower section having an offset locking terminal at its lower end, bars adapted to be applied to door sections, hanger bars pivotally connected with said first-mentioned bars and adapted to move to and from a position disposed between said first-mentioned bars, said hanger bars being movable at a side of those portions of the A bolt sections between the offset terminals thereof and in the plane of said offset terminals moving in said plane to and from said position between the first-mentioned bars. I

JOHN H. STEWART. 

